Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 20 for “"thermoelectricity"”.
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Theory of molecular scale thermoelectricity
… theory and equilibrium Green’s function to study thermoelectricity in molecular scale. We have aimed to improve the efficiency of single molecules in converting heat to electricity by carefully designing them. We introduced a novel strategy for designing molecules with low thermal conductance. …
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Generalized drift-diffusion for microscopic thermoelectricity
Although thermoelectric elements increasingly incorporate nano-scale features in similar material systems as other micro-electronic devices, the former are described in the language of irreversible thermodynamics while devices such as heterojunction bipolar transistors and semiconductor lasers are …
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Magnetoresistance and Thermoelectricity in Quasi-Low Dimensional Semimetals
The emergent properties and low energy excitations of low dimensional condensed matter systems are profoundly affected by the interplay of strong magnetic field and the anisotropic ionic potential of the crystal lattice. Detailed information of the underlying physics of such systems can be probed …
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Quantum theory of sensing and thermoelectricity in molecular nanostructures
This thesis presents a series of studies into the electronic and thermoelectric properties of molecular junction single organic molecules: They include perylene Bisimide (PBIs), naphthalenediimide (NDI), metallo-porphryins and a large set of symmetric and asymmetric molecules. Two main techniques …
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Bismuth nanowire and antidot array studies motivated by thermoelectricity
Porous anodic alumina (PAA) films were utilized to template the fabrication of nanostructures of bismuth, antimony and bismuth-antimony alloys. The cylindrical template pores were used to synthesize nanowires by electrochemical methods. The porous surface of the template was used as a substrate for …
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Functional nanoelectronic devices: single-electron transport, memristivity, and thermoelectricity in nanoscale flms using self-assembly and graphene
… A third section reports on a project studying thermoelectricity in self-assembled molecular junctions, as they show potential for improved thermoelectric efficiency for energy harvesting; this is discussed in the dissertation. Strategies to benchmark the studies are presented with relevant …
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Strongly correlated electron behavior in transition metal intermetallics: enhanced thermoelectricity and quantum criticality in FeGa₃ and superconductivity in NiBi₃
<p>TGa3 (T = Fe, Ru & Os) and RuIn3 are a class of isostructural intermetallic binary compounds with interesting physical and structural properties. These materials are non-magnetic, narrow band gap semiconductors with large n-type thermopower below room temperature. Chemical doping drastically …
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Theory of electron and phonon transport in nano and molecular quantum devices : design strategies for molecular electronics and thermoelectricity
… junctions, quantum interference rules and thermoelectricity (or thermal management). I demonstrate the discriminating sensing properties of new bilayer-graphene, sculpturene-based nano-pore devices for DNA sequencing. A unique and novel signal processing method is presented to selectively …
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Nonequilibrium and transport in proximity of superconductors
… Electron transport, non-equilibrium response, thermoelectricity, and fluctuations in such devices have attained significant interest. Thermoelectric effects in particular are one of the least understood aspects of superconductivity. Quantitative understanding of the observations in the …
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Emergent properties of misfit layer compounds from first principles.
… charge density waves, and good thermoelectricity. However, research has mostly focused on specific compounds and trial-and-error synthesis, making the design of misfits’ emergent properties hindered by a lack of a global picture. Our work offers an original perspective by …
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Numerical Investigation of Various Heat Transfer Performance Enhancement Configurations for Energy Harvesting Applications
… over wide range of applications, one of which is thermoelectricity. Hence, making use of gas turbine technologies in thermoelectrics would surely improve the efficiency of existing TEGs. This study makes an effort to develop innovative technologies for gas turbine as well as thermoelectric …
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Nano-scale Heat Transfer in Nanostructures: Toward Understanding and Engineering Thermal Transport
… lower thermal conductivity, which could promote thermoelectricity. The study of high-temperature coating composite materials helps with the understanding of the role played by composition and the structural characterization, which is difficult to be approached by experiments. The method applied …
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Heat transport in Thermoelectric materials: from Layered systems to organic crystals
Thermoelectricity (TE) is a promising and sustainable source of energy that manage to convert wasted heat into electricity using the Seebeck effect. A good material for TE application should have with low thermal conductivity (k) and high Seebeck coefficient and electrical conductivity, because TE …
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Theory of molecular-scale transport in graphene nanojunctions
… optotronics. Recent studies of single-molecule thermoelectricity have identified families of high-performance molecules. However, controlled scalability might be used to boost electrical and thermoelectric performance over the current single-junction paradigm. In order to translate this …
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Improving efficiency of ID thermopower wave devices and studying 2D reaction waves
… in heat harvesting applications such as thermoelectricity and thermophotovoltaics. We calculated the improvement in efficiency of a modified thermophotovoltaics setup, when the input is a reaction wave, operating under superadiabatic conditions. Experimentally, we studied these …
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Quantum control of the electronic and thermal properties of Fullerenes and Exohedral Fullerenes
… are geometrically symmetric. If fullerenebased thermoelectricity is to become a viable technology, then fullerenes exhibiting both positive and negative Seebeck coefficients will be needed and therefore I also calculate the thermoelectric properties of the naturally occurring fullerene C60 known …
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Materials Physics for Thermoelectric and Related Energetic Applications
… generation and refrigeration. The performance of thermoelectricity generation and the refrigeration is characterized by a dimensionless number called the Figure-of-Merit (ZT), defined as ZT = [sigma]-S 2T / [kappa], where a is the electrical conductivity, K is the thermal conductivity, S is the …
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Small-scale thermoelectric generator for off-grid power
The goal of this research is to develop a small-scale energy resource that can be used by the survivors of a natural disaster event who are left without power. The desired energy resource is intended for low power applications (e.g. trickle charge of electronic devices such as mobile phones), …
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Experimental Realisation of Energy Harvesters built from Quantum Dots and Quantum Wells
This thesis starts with an introduction to the background semiconductor physics required for carrying out this PhD research. I have then presented the work that demonstrates, both theoretically and experimentally, an energy harvester built from two resonant-tunnelling quantum dots. A device, …
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Investigation of spin-caloric and spin-orbit torque materials by vectorial spin Seebeck measurements and an advanced x-ray magnetic reflectivity analysis
… is also intrinsically tied to the field of thermoelectricity. A decade ago, the discovery of the spin Seebeck effect (SSE), which specifies the generation of a spin voltage as a result of a temperature gradient, introduced the new fields of spin caloric transport. Here, the longitudinal spin …